Hi. I'm making a robot. This robot has 2 Continuous Rotation Servo Motors (CRS Motors) to drive it. The robot must be able to turn just a little, or a lot. My question is, how (in the code) do I get the Servos to move just a certain amount? Is the secret in the DELAY feature AFTER the turn function, or in the spped of the Motors, or what? My question is- how do I get the robot to turn at a certain angle with CRS Motors? PLEASE HELP! :o
Servos that have been set up for continuous rotation are just cheap motors. You sort-of-sometimes have some control over their speed but not much else.
Either turn for a specific amount of time or consider different motors that will let you control distance more precisely. Stepper motors are good.
CRS is the acronym for Can't Remember Shit. I can't remember what the acronym is for continuous rotation not-really-a-servo is, but it is NOT CRS.
Getting a motor to move a distance is a combination of speed and time.
Don't use the delay() function for timing. Use millis() as illustrated in Several Things at a Time
...R
My question is- how do I get the robot to turn at a certain angle with CRS Motors?
Without some other form of feedback, like wheel encoders, gyro or magnetometer, I'm afraid the answer is "you can't".
A turn time that works with fresh batteries may well not work after a few minutes if operation.
So is there ANY way to make it turn just a little or all the way with just the Servo's? ANYTHING?
Is there a formula for time and speed to calculate turn with a Servo?
WesleyRTech:
Is there a formula for time and speed to calculate turn with a Servo?
I don't believe there is any off-the-shelf formula.
But you can do some experiments with your own hardware and you may be able to figure out a reasonable system. As others have said, it will not provide absolutely accurate position control unless you can provide some feedback so it "knows" when it has turned the required amount.
...R